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16 Μαρ 2020 · A fish’s gills are situated one set on either side of the body and near the back of the head. They are open to the gullet at the front and open to the external environment behind.
The gills push the oxygen-poor water out through openings in the sides of the pharynx. Some fish, like sharks and lampreys, possess multiple gill openings. However, bony fish have a single gill opening on each side. This opening is hidden beneath a protective bony cover called the operculum.
2 Ιαν 2023 · Fish gills are crucial respiratory organs that enable fish to breathe underwater by extracting oxygen dissolved in water and eliminating carbon dioxide from their bodies. Typically situated on each side of the fish’s head, these gills are shielded by a bony plate known as the operculum.
When swimming fast, fish like sharks and tunas open both their mouths and gill openings to let water pass continuously through their gills. They do not need to open and close their mouth because water is pushed over their gills by their swimming action.
17 Ιαν 2020 · Gills are branching organs located on the side of fish heads that have many, many small blood vessels called capillaries. As the fish opens its mouth, water runs over the gills, and blood in the capillaries picks up oxygen that’s dissolved in the water.
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29 Σεπ 2024 · Fish - Gills, Lungs, Swim Bladder: Most fishes exchange dissolved oxygen and carbon dioxide in water using gills which lie behind and to the side of the mouth cavity. The circulatory system consists of the heart, arteries, capillaries, and veins.
